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Use one History table per thread
authorMarco Costalba <mcostalba@gmail.com>
Tue, 2 Jun 2009 09:20:41 +0000 (10:20 +0100)
committerMarco Costalba <mcostalba@gmail.com>
Wed, 3 Jun 2009 16:34:35 +0000 (17:34 +0100)
This reduces contention and reduce history trashing
effect especially at high search depths.

No functional change for single CPU case.

After 999 games at 1+0 on Dual Core Intel we have

Mod vs Orig  +233 =526 -240  -2 ELO

We need to test at longer time controls and possibly with
a QUAD where we could foreseen an improvment.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>

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